Write structural Verilog HDL models for 4-bit binary adder and subtractor ||

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#4BitSubtractor
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#BinarySubtraction
#DigitalCircuits
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A 4-bit adder cum subtractor is a digital circuit that can perform both addition and subtraction operations on 4-bit binary numbers. It takes two 4-bit inputs, A and B, and a control signal, which determines whether the circuit performs an addition or subtraction operation.
Here's a description of how a 4-bit adder cum subtractor can be implemented using basic digital logic gates:
Inputs: A (A3A2A1A0), B (B3B2B1B0), and control signal C.
Carry-in and Borrow-in: Initialize two input signals, C_in and B_in, to zero.
Full Adder Circuit: Use four full adders to perform addition or subtraction of the individual bits of A and B.
a. For each bit position (0 to 3), perform the following steps:
Connect the corresponding bits from A and B as inputs to the full adder.
Connect the C_in signal as the carry input to the full adder.
Connect the output carry (C_out) of the full adder to the next full adder's carry input (C_in) and the B_in signal as the borrow input.
Connect the sum output (S) of the full adder to the corresponding bit position in the output result.
Output Result: The sum outputs of the full adders form the 4-bit result of the addition or subtraction operation.
a. If C is set to 0, the circuit performs addition. The result is the sum of A and B.
b. If C is set to 1, the circuit performs subtraction. The result is the difference between A and B.
Carry-out and Borrow-out: The carry-out (C_out) of the most significant full adder represents the carry or borrow generated during addition or subtraction.
a. If C is set to 0, C_out represents the carry generated during addition.
b. If C is set to 1, C_out represents the borrow generated during subtraction.
Overflow Detection: Check for overflow conditions when performing addition or subtraction. Overflow occurs when the sum of two positive numbers yields a negative result or when the sum of two negative numbers yields a positive result.
a. For addition, if the carry-out (C_out) of the most significant full adder is different from the carry-in (C_in), an overflow has occurred.
b. For subtraction, if the borrow-out (B_out) of the most significant full adder is different from the borrow-in (B_in), an overflow has occurred.
That's the basic description of a 4-bit adder cum subtractor. This circuit can be expanded to handle larger numbers by adding more bits and cascading additional full adders.
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